Composite geomembrane for high-speed railway roadbed

Abstract

The invention provides a composite geomembrane for a high-speed railway roadbed. The corrosion resistance and freeze-thawing resistance of the composite geomembrane are effectively improved, so that the geomembrane has good drainage performance, and the use stability of the geomembrane is remarkably improved. The composite geomembrane is formed by compounding an upper polypropylene filament composite geotechnical cloth, a middle layer polyethylene or polyvinyl chloride composite geomembrane and a lower polypropylene filament needled geotechnical cloth which are sequentially stacked from top tobottom. The upper layer polypropylene filament composite geotechnical cloth is formed by compounding an upper layer fine polypropylene filament geotechnical cloth and a lower layer thick polypropylene filament geotechnical cloth, and the gram weight is 150-300 g / m<2>, wherein the gram weight of the upper layer fine polypropylene filament geotechnical cloth is 50-150 g / m<2>, the fiber fineness is5-7 D, the gram weight of the lower layer thick polypropylene filament geotechnical cloth is 75-250 g / m<2>, and the fiber fineness is 9-15 D.

Description

technical field [0001] The invention belongs to the technical fields of construction engineering and civil engineering waterproofing, and in particular relates to a composite geomembrane for high-speed railway subgrades. Background technique [0002] The phenomenon of muddying in the subgrade bed is a common disease of railway subgrades in my country. The use of composite geomembranes to prevent muddying of the subgrade bed has been widely used. At present, polyester composite geomembranes are mainly used, but because polyester geotextiles It has weak acid and alkali resistance and poor corrosion resistance, so it is difficult to adapt to the complex environment along the railway, especially in the environment of high cold, high salinity and alkali, etc., it is easy to corrode and lose its strength. Moreover, during the long-term use of the existing composite geomembrane, the upper geotextile structure is easily blocked by sand and gravel, which greatly reduces the lateral dr...

AI Technical Summary

Problems solved by technology

[0002] The phenomenon of muddying in the subgrade bed is a common disease of railway subgrades in my country. The use of composite geomembranes to prevent muddying of the subgrade bed has been widely used. At present, polyester composite geomembranes are mainly used, but because polyester geotextiles It has weak acid and alkali resistance and poor corrosion resistance, so it is difficult to adapt to the complex environment along the railway, especially in the environment of high cold, high salinity and alkali, etc., it is easy to corrode and lose its strength

Moreover, during the long-term use of the existing composite geomembrane, the upper geotextile structure is easily blocked by gravel, which greatly reduces the lateral drainage capacity, and easily causes the surface to infiltrate and accumulate rainwater, which affects the stability and service life of the railway subgrade.

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